looks very tempting....but I think you can get as much if not more light from some LED lights for about the same $. LED's last a lot longer and can be turned on/off without messing with bulb life the way an HID bulb does.
Here's and LED I'd consider:CygoLite Rover II Xtra LED Headlighthttp://www.performancebike.com/bikes..._400014_400158